Bookmark previews?

Is there any way to view the URL of a bookmark without opening the page? Or maybe like a plugin to view a preview thumbnail or something?

Right now I have Firefox, Safari, and Opera.

On my PC in opera, when you roll over a bookmark it shows the URL down in the status bar... is there anything like that for macs? I searched though settings and even with the status bar active, it doesn't show a bookmark's URL.

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.

mac: a waterproof raincoat made of rubberized fabric
MAC: a data communication protocol sub-layer, also known as the Media Access Control
Mac: a brand name which covers several lines of personal computers designed, developed, and marketed by Apple Inc.